One of my Barred Rocks rear (abdomen) is sagging or drooping. When the others lean over to eat, their fuzzy butts go up. Her's goes up a little but mostly just says down between here legs. I felt the area and didn't feel any type of mass. (not that I would know what I was feeling for). Noted a little poop on here feathers in the rear. She seems to be eating/drinking/walking and pooping ok. Not sure if she's laying. We have 6 (one pair, 3 different breeds) and get 3-4 eggs daily and I'm pretty sure one of our NH Reds just has never started laying. Any ideas?